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When click link for sytax help the popup window show whis message:

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in production.log

NameError (uninitialized constant HelpController):
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:266:in `load_missing_constant'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:452:in `const_missing'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:464:in `const_missing'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/inflector.rb:250:in `constantize'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
/var/lib/gems/1.8/gems/actionpack-1.13.6/lib/action_controller/routing.rb:1317:in `recognize'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/dispatcher.rb:40:in `dispatch'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:168:in `process_request'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:143:in `process_each_request!'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:109:in `with_signal_handler'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:142:in `process_each_request!'
/usr/lib/ruby/1.8/fcgi.rb:612:in `each_cgi'
/usr/lib/ruby/1.8/fcgi.rb:609:in `each'
/usr/lib/ruby/1.8/fcgi.rb:609:in `each_cgi'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:141:in `process_each_request!'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:55:in `process!'
/var/lib/gems/1.8/gems/rails-1.2.6/lib/fcgi_handler.rb:25:in `process!'
dispatch.fcgi:24